IVectorMapsPieMarker Interface

Declares properties of business objects that can be displayed as a pie chart marker on a vector map using the Maps Module.

Namespace: DevExpress.Persistent.Base

Assembly: DevExpress.Persistent.Base.v18.2.dll

Declaration

C#

public interface IVectorMapsPieMarker :
    IBaseMapsMarker

VB.NET

Public Interface IVectorMapsPieMarker
    Inherits IBaseMapsMarker

Remarks

You can implement this interface in an XPO or Entity Framework business object. As a result, the WebVectorMapsListEditor will be used to display List Views of this business object. Each object is displayed as a pie chart marker. An object’s Detail View is displayed after clicking a marker. The sizes of pie chart slices are specified using the IVectorMapsPieMarker.Values property.

XPO Example

C#

using DevExpress.Xpo;
using DevExpress.Persistent.Base;
using DevExpress.Persistent.BaseImpl;
// ...
[DefaultClassOptions, DefaultProperty("Title")]
public class VectorMapsListEditorPieMarker : BaseObject, IVectorMapsPieMarker {
    public VectorMapsListEditorPieMarker(Session session) : base(session) { }
    public string Title { get; set; }
    [Browsable(false)]
    public string Tooltip {
        get {
            string valuesStr = "";
            string[] captions = { "Category A", "Category B", "Category C" };
            float[] values = { CategoryAPercentage, CategoryBPercentage, CategoryCPercentage };
            int index = 0;
            foreach(float value in values) {
                if(index != 0)
                    valuesStr += "<br>";
                if(index >= captions.Length)
                    index = captions.Length - 1;
                valuesStr += string.Format("{0}: {1}%", captions[index++], value);
            }
            return string.Format("<b>{0}</b><br>{1}", Title, valuesStr);
        }
    }
    public double Latitude { get; set; }
    public double Longitude { get; set; }
    [Browsable(false)]
    public IList<float> Values {
        get {
            return new List<float> { CategoryAPercentage, CategoryBPercentage, CategoryCPercentage };
        }
    }
    [DevExpress.Xpo.DisplayName("Category A percentage")]
    public float CategoryAPercentage { get; set; }
    [DevExpress.Xpo.DisplayName("Category B percentage")]
    public float CategoryBPercentage { get; set; }
    [DevExpress.Xpo.DisplayName("Category C percentage")]
    public float CategoryCPercentage { get; set; }
}

VB.NET

Imports DevExpress.Xpo
Imports DevExpress.Persistent.Base
Imports DevExpress.Persistent.BaseImpl
' ...
<DefaultClassOptions, DefaultProperty("Title")> _
Public Class VectorMapsListEditorPieMarker
    Inherits BaseObject
    Implements IVectorMapsPieMarker
    Public Sub New(ByVal session As Session)
        MyBase.New(session)
    End Sub
    Public Property Title() As String
    <Browsable(False)> _
    Public ReadOnly Property Tooltip() As String
        Get
            Dim valuesStr As String = ""
            Dim captions() As String = { "Category A", "Category B", "Category C" }
            Dim _values() As Single = { CategoryAPercentage, CategoryBPercentage, CategoryCPercentage }
            Dim index As Integer = 0
            For Each value As Single In _values
                If index <> 0 Then
                    valuesStr &= "<br>"
                End If
                If index >= captions.Length Then
                    index = captions.Length - 1
                End If
                valuesStr &= String.Format("{0}: {1}%", captions(index), value)
                index += 1
            Next value
            Return String.Format("<b>{0}</b><br>{1}", Title, valuesStr)
        End Get
    End Property
    Public Property Latitude() As Double
    Public Property Longitude() As Double
    <Browsable(False)> _
    Public ReadOnly Property Values() As IList(Of Single)
        Get
            Return New List(Of Single) From {CategoryAPercentage, CategoryBPercentage, CategoryCPercentage}
        End Get
    End Property
    <DevExpress.Xpo.DisplayName("Category A percentage")> _
    Public Property CategoryAPercentage() As Single
    <DevExpress.Xpo.DisplayName("Category B percentage")> _
    Public Property CategoryBPercentage() As Single
    <DevExpress.Xpo.DisplayName("Category C percentage")> _
    Public Property CategoryCPercentage() As Single
End Class

Note

See the complete example in the VectorMapsListEditorDemoObject.cs file in the Feature Center demo that is installed in the %PUBLIC%\Documents\DevExpress Demos 18.2\Components\eXpressApp Framework\FeatureCenter folder by default, or refer to the Feature Center demo online.

EF Example

C#

using DevExpress.Persistent.Base;
// ...
[DefaultClassOptions, DefaultProperty("Title")]
public class VectorMapsListEditorPieMarker, IVectorMapsPieMarker {
    public int ID { get; private set; }
    public string Title { get; set; }
    [Browsable(false)]
    public string Tooltip {
        get {
            string valuesStr = "";
            string[] captions = { "Category A", "Category B", "Category C" };
            float[] values = { CategoryAPercentage, CategoryBPercentage, CategoryCPercentage };
            int index = 0;
            foreach(float value in values) {
                if(index != 0)
                    valuesStr += "<br>";
                if(index >= captions.Length)
                    index = captions.Length - 1;
                valuesStr += string.Format("{0}: {1}%", captions[index++], value);
            }
            return string.Format("<b>{0}</b><br>{1}", Title, valuesStr);
        }
    }
    public double Latitude { get; set; }
    public double Longitude { get; set; }
    [Browsable(false)]
    public IList<float> Values {
        get {
            return new List<float> { CategoryAPercentage, CategoryBPercentage, CategoryCPercentage };
        }
    }
    [DevExpress.Xpo.DisplayName("Category A percentage")]
    public float CategoryAPercentage { get; set; }
    [DevExpress.Xpo.DisplayName("Category B percentage")]
    public float CategoryBPercentage { get; set; }
    [DevExpress.Xpo.DisplayName("Category C percentage")]
    public float CategoryCPercentage { get; set; }
}

VB.NET

Imports DevExpress.Persistent.Base
' ...
<DefaultClassOptions, DefaultProperty("Title")> _
Public Class VectorMapsListEditorPieMarker, IVectorMapsPieMarker
    Private privateID As Integer
    Public Property ID() As Integer
        Get
            Return privateID
        End Get
        Private Set(ByVal value As Integer)
            privateID = value
        End Set
    End Property
    Public Property Title() As String
    <Browsable(False)> _
    Public ReadOnly Property Tooltip() As String
        Get
            Dim valuesStr As String = ""
            Dim captions() As String = { "Category A", "Category B", "Category C" }
            Dim _values() As Single = { CategoryAPercentage, CategoryBPercentage, CategoryCPercentage }
            Dim index As Integer = 0
            For Each value As Single In _values
                If index <> 0 Then
                    valuesStr &= "<br>"
                End If
                If index >= captions.Length Then
                    index = captions.Length - 1
                End If
                valuesStr &= String.Format("{0}: {1}%", captions(index), value)
                index += 1
            Next value
            Return String.Format("<b>{0}</b><br>{1}", Title, valuesStr)
        End Get
    End Property
    Public Property Latitude() As Double
    Public Property Longitude() As Double
    <Browsable(False)> _
    Public ReadOnly Property Values() As IList(Of Single)
        Get
            Return New List(Of Single) From {CategoryAPercentage, CategoryBPercentage, CategoryCPercentage}
        End Get
    End Property
    <DevExpress.Xpo.DisplayName("Category A percentage")> _
    Public Property CategoryAPercentage() As Single
    <DevExpress.Xpo.DisplayName("Category B percentage")> _
    Public Property CategoryBPercentage() As Single
    <DevExpress.Xpo.DisplayName("Category C percentage")> _
    Public Property CategoryCPercentage() As Single
End Class